Method of fabricating dispersion compensation fiber
AssigneeSumitomo Electric Industries, Ltd.
InventorsMasashi Onishi, Koji Amemiya, Chie Fukuda, Hiroo Kanamori
Life of this patent
Estimating the term…
Abstract
In a method of fabricating DCF, the fiber is drawn while rotating said optical fiber preform, wherein a rotational speed of said optical fiber preform is 10 to 1,000 rpm, a drawing speed is 50 to 1,000 m/min, and a drawing tension is 2.4 to 13 kg/mm.sup.2.
Claims13
A method of fabricating a dispersion compensation fiber, comprising the steps of:
- (a) preparing a silica-based optical fiber preform comprising a core and a cladding which surrounds said core, wherein (nc-n1)/n1 is 1% to 3%, where nc is a refractive index of said core and n1 is a refractive index of said cladding;
- and
- (b) performing drawing while rotating said optical fiber preform about an axis,
- wherein a rotational speed of said optical fiber preform is 10 to 1,000 rpm,
- a drawing speed is 50 to 1,000 m/min, and
- a drawing tension is greater than 2.4 kg/mm.sup.2.
A method of fabricating a dispersion compensation fiber, comprising the steps of:
- (a) preparing a silica-based optical fiber preform comprising a core, a first cladding which surrounds said core and a second cladding which surrounds said first cladding, wherein (nc-n2)/n2 is 2 % to 3 %, and wherein (n2-n1)/n2 is 0.4% to 1%, where nc is a refractive index of said core, n1 is a refractive index of said first cladding, and n2 is a refractive index of said second cladding;
- and
- (b) performing drawing while rotating said optical fiber preform about an axis,
- wherein a rotational speed of said optical fiber preform is 10 to 1,000 rpm,
- a drawing speed is 50 to 1,000 m/min, and
- a drawing tension is greater than 2.4 kg/mm.sup.2.
An optical transmission system having a dispersion compensation fiber, wherein said dispersion compensation fiber comprises:
- (a) a core;
- and
- (b) a cladding surrounding said core,
- wherein (nc-n1)/n1 is 1% to 3%,
- a noncircularity of said core is not more than 1%,
- said dispersion compensation fiber is twisted at a rate of 1 to 20 turns per meter, and
- a polarization mode dispersion of said dispersion compensation fiber is not more than 0.5 ps/km.sup.-2, where nc is a refractive index of said core and n1 is a refractive index of said cladding.
An optical transmission system having a dispersion compensation fiber, wherein said dispersion compensation fiber comprises
- (a) a core;
- (b) a first cladding surrounding said core;
- and
- (c) a second cladding surrounding said first cladding,
- wherein
- (nc-n2)/n2 is 2% to 3%,
- (n2-n1)/n2 is 0.4% to 1%,
- a noncircularity of said core is not more than 1%,
- said dispersion compensation fiber is twisted at a rate of 1 to 20 turns per meter, and
- a polarization mode dispersion of said dispersion compensation fiber is not more than 0.5 ps/km.sup.-2, where nc is a refractive index of said core, n1 is a refractive index of said first cladding, and n2 is a refractive index of said second cladding.
An optical transmission system having a dispersion compensation fiber, wherein said dispersion compensation fiber is comprised of a material comprising either one of AlF3, ZrF4 and HfF4, and wherein said dispersion compensation fiber twisted at a rate of 1 to 20 turns per meter.
Dependencies are inferred from the claim text.